The OSF3.5 has been one of those knives that has always had a huge following. OSF stands for "Open Source Folder."

The knife design itself is a modified sheep?s foot blade with a properly engineered frame set. The single point rear standoff/backspacer is large enough to handle knife stresses but small enough to allow a rather large handle to blade ratio.

The blade steel is CPM-S35VN, with an excellent heat treat that seamlessly flows into and out of the titanium frame set. There are several options to choose from to make this knife your very own -- including pocket clips, pivots, backspacers, and inlays. This all adds up to a NPD (Never Put it Down), not just an EDC!